'''字符串比较'''
print('apple' > 'app')
print('apple' > 'banana')
print(ord('a'),ord('b'))
print(ord('吴'))
print(chr(21556))

a=b='python'
c='python'

print(a == b)
print(c == a)
print(a is b)
print(c is a)
print(id(a),id(b),id(c))